Electric-battery depolarizer.



MAJOR E. HULMES, 01?..LriKEWGOD, OHIG, ASSIGNGR TQ NATIONAL CARBON COMPANY, 333%, A GGFREURJQTEGN 03 NEW YORK.

ELEGTRIC BA'lTERY Specification of Letters Patent.

menses Patented Get, 15, 1918,,

. Ho Drawing. Griginal application filed January 7, 1916, serial No 70,768. Divided and this application filed February 21, 193.8. Serial No. 218,9l34.

v To all whom it may concern:

' Be it known that I, MAJOR E. HOLMES, a citizen of the United States, residing at Lakewood in'the county of Cuyahoga and s -Sta'te of dhio, have invented a certain new I ""iid useful Improvement in Electric-Battery Depolarizers, of which the following is ai fullpclear, and exact description.

This invention relates to depolarizers for dry cells and is a division of my application filed January7, 1916, Serial No. 70,? 68.

In my prior ap lication above referred to I have disclosed t he properties of molybdenum trioxid as a depolarizer. The molybdates, which may be regarded as chemical combinations of molybdenum trioxicl with basic oxids or salts, are less solubie in the cell electrolyte than is molybdenum trioxid, and inasmuch as insolubility is a very vain- 20 able characteristic in depolarizers, I propose to use niolybdates pose.

There are various molybdates that may be used, but I prefer the molyhdates of sodium and lead or double niolybdates such as ammonium phospho molybdate '(NH,) PO,.- 121M 0 l iavi ng described my invention, What I claim is: p

1. In primary batteries, positive and negative electrodes and a depolarizer consisting of molybdenum tricxid combined with a basic oXid.

- 2. In primary batteries, positive and negative electrodes and a depolarizer consisting of ammonium phospho molybdate.

In testimony whereof, I hereunto afix my signature.

in a dry cell for this pnr- MAJOR E, HOLMES. 

